Pediatric Intramuscular Hematoma

  • Etiology:
    — Trauma
    — Post-procedural’
    — Anticoagulation
  • Imaging US:
    — Acutely is hypoechoic lesion within muscle
    — Chronically may be septated, isoechoic, or calcified
  • Imaging CT:
    — Acutely see diffuse isodense enlargement of a muscle which may have areas of high density
    — Chronically appears low density
  • DDX:
  • Complications: Infection, calcification
  • Treatment:
  • Clinical:

Radiology Cases of Intramuscular Hematoma

Radiology Cases of Intramuscular Hematoma in the Neck and Chest Wall

CT of intramuscular hematoma in patient on extracorporeal membrane oxygenation (ECMO)
Axial CT with contrast of the chest shows hematomas in the right sternocleidomastoid muscle (above) near the ECMO catheter insertion site and left pectoralis major muscle.

Radiology Cases of Intramuscular Hematoma in the Anterior Abdominal Wall Into an Underlying Lymphatic Malformation

MRI of intramuscular hematoma associated with a lymphatic malformation of the anterior abdominal wall
Axial T1 without contrast (above), T2 (middle) and T2 with fat saturation (below) MRI of the abdomen shows an oval heterogenous fluid collection of layering mixed fluid intensities centered in the right anterior abdominal wall muscle and surrounded by muscle tissue.